I don't know what real life military and diplomatic protocol is today, and I certainly do not know what it will be in the late 24th century.
But, given that the line about Worf giving up his ambassadorship was cut from Nemesis, is there any reason he couldn't still be an ambassador who just chose to wear his Starfleet uniform when he attended the wedding of his long-time friends and fellow officers? Don't retired military personnel today still have the right to wear their uniforms for formal occasions?
But, given that the line about Worf giving up his ambassadorship was cut from Nemesis, is there any reason he couldn't still be an ambassador who just chose to wear his Starfleet uniform when he attended the wedding of his long-time friends and fellow officers? Don't retired military personnel today still have the right to wear their uniforms for formal occasions?